1293681 has 8 divisors (see below), whose sum is σ = 1800000. Its totient is φ = 824912.

The previous prime is 1293659. The next prime is 1293701. The reversal of 1293681 is 1863921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1293681 - 2⁷ = 1293553 is a prime.

It is a super-2 number, since 2×1293681² = 3347221059522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1295681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9306 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (225000).

2^1293681 is an apocalyptic number.

It is an amenable number.

1293681 is a deficient number, since it is larger than the sum of its proper divisors (506319).

1293681 is a wasteful number, since it uses less digits than its factorization.

1293681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18775.

The product of its digits is 2592, while the sum is 30.

The square root of 1293681 is about 1137.4009847015. The cubic root of 1293681 is about 108.9621673826.

The spelling of 1293681 in words is "one million, two hundred ninety-three thousand, six hundred eighty-one".